A promising strategy to increase the tensile failure strain of carbon fibre-reinforced composites is to hybridise carbon fibres with other, higher-elongation fibres. The resulting increase in failure strain is known as the hybrid effect. In the present article, a global load-sharing model for hybrid composites is developed and used to carry out a parametric study for carbon/glass hybrids. Hybrid effects of up to 15% increase in failure strain are predicted, corresponding reasonably well to literature data. Scatter in the carbon fibre strength is shown to be crucial for the hybrid effect, while the scatter in glass fibre strength is much less important. In contrast to reports in earlier literature, the ratio of failure strains of the two fibres has only a small influence on the hybrid effect. The results provide guidelines for designing optimal hybrid composites.
Bibliographical noteDate of Acceptance: 17/08/2015
The work leading to this publication has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under the topic NMP-2009-2.5-1, as part of the project HIVOCOMP (Grant agreement no. 246389). The authors thank the Agency for Innovation by Science and Technology in Flanders (IWT) for the grant of YS. IV holds the Toray Chair in Composite Materials at KU Leuven and acknowledges its support for this work. YS wishes to thank Professor William Curtin for bringing the idea of an extended GLS model to his attention.
- A. Strengthening and mechanisms
- B. Fibre-reinforced composite material
- C. Hybrid composites
- C. Probability and statistics